<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
                <TdHeader @addTodo="addTodo"></TdHeader>
                <TdList :todos="todos"></TdList>
                <TdFooter
                    :todos="todos"
                    @checkAllTodo="checkAllTodo"
                    @clearAllTodo="clearAllTodo"
                ></TdFooter>
            </div>
        </div>
    </div>
</template>

<script>
import TdHeader from "./components/TdHerder.vue";
import TdList from "./components/TdList.vue";
import TdFooter from "./components/TdFooter.vue";

export default {
    name: "App",
    components: {
        TdHeader,
        TdList,
        TdFooter,
    },
    data() {
        return {
            todos: JSON.parse(localStorage.getItem("todos")) || [],
        };
    },
    methods: {
        //添加一个todo
        addTodo(todoObj) {
            console.log("我是App组件，我收到了数据：", todoObj);
            this.todos.unshift(todoObj);
        },
        //勾选or取消勾选一个todo
        checkTodo(id) {
            this.todos.forEach((todo) => {
                if (todo.id === id) todo.done = !todo.done;
            });
        },
        //删除一个todo
        deleteTodo(id) {
            this.todos = this.todos.filter((todo) => {
                return todo.id !== id;
            });
        },
        //全选or取消全选
        checkAllTodo(done) {
            this.todos.forEach((todo) => {
                todo.done = done;
            });
        },
        //清除所有已经完成的todo
        clearAllTodo() {
            this.todos = this.todos.filter((todo) => {
                return !todo.done;
            });
        },
    },
    watch: {
        todos: {
            deep: true,
            handler(value) {
                localStorage.setItem("todos", JSON.stringify(value));
            },
        },
    },
    mounted() {
        this.$bus.$on("checkTodo", this.checkTodo);
        this.$bus.$on("deleteTodo", this.deleteTodo);
    },
    beforeDestroy() {
        this.$bus.$off("checkTodo");
        this.$bus.$off("deleteTodo");
    },
};
</script>

<style>
/*base*/
body {
    background: #fff;
}

.btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
        0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
}

.btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
}

.btn:focus {
    outline: none;
}

.todo-container {
    width: 600px;
    margin: 0 auto;
}
.todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
</style>